Ms Bennett made no reference to the gaffe in this afternoon’s speech, and instead focused on her vision for “a society that works for the many, not just the few”.

She said: "We believe that to be a decent, humane, caring society, social care must be free.

"We believe those who have the most should contribute to help pay for social care. We need a range of new taxes aimed at making Britain a more equal society.

"We would introduce a new wealth tax, rigorously clamp down on tax avoidance and evasion and introduce a financial transaction tax - a Robin Hood Tax, and we are not ashamed to say that those on incomes above £100,000 should pay more income tax.

"Providing free social care for the over-65's means security and freedom from fear, suffering and loneliness for many, and it means 200,000 new jobs and training places.

"We will consult experts, users, and care workers on its exact design - but our manifesto will include this as a core pledge: social care is not a privilege, it is a right."

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Ms Bennett said the disintegration of the two party system was paving the way for a new form of politics. She said: "The politics of the future is not a politics of transaction, that discredited politics which offers selected individuals and groups a bribe of short-term, unsustainable personal advantage."

She added: "In just nine weeks' time, you will have in your hands something miraculous... the possibility of a peaceful political revolution.

"Your vote can change the face of Britain. It can end the failed austerity experiment, end the spiteful blaming of the poor, the sick, the vulnerable for the mistakes of the wealthy.

"This election can be a turning point in history. The moment where we can deliver a better Britain, a Britain which works for all its people... a Britain which cares."

More than 1,300 activists are expected to attend the three day conference at Liverpool's ACC, making it the largest event the party has staged.

Party members greeted the start of her speech with a standing ovation and former party leader Caroline Lucas, the party's first MP, told conference she was "proud" of her "colleague and friend".